Can anybody offer any help

Have been told that I have a great, great uncle who went down on the Titanic, All I know is he was on his way to Canada as a Mountie, no body knows his name or if he had come home on holiday or if this was his first trip there. All we do know is he was my gran-dads Smiths uncle on my dads side of the family, a family from Sheffield.
Could anyone sugest if there is any way of finding out any more info so as we can do a family tree.